Heat-transmitting apparatus



July 8, 1930.

E. MORTERUD HEAT TRANSMITTING APPARATUS Fi'led June 16, 1927 3 Sheets-Sheet 1 July 8, 1930. E. MORTERUD 1,770,320

: HEAT TRANSMITTING APPARATUS Filed June 16, 1927 3 Sheets-Sheet 2 fJfarfra July 8, 1930. MORTERUD 1,770,320

HEAT TRANSMITTING APPARATUS Filed June 16, 1927 3 Sheets-Sheet 3 fig. E1

Patented July 8, 1930 nnun monrnnun, or 'ronnnaon, NEAR MOSS, NORWAY HEAT-TRANSMITTING APPARATUS Application filed June 16, 1927, Serial No. 199,340, and in Norway June 25, 1926.

It is a-well-known fact that the steam, in order to obtain the most intensive condensation in heating and evaporation apparatus, should have the highest possibile velocity, and

that the permanent gases which accompany thesteamfmust be removed as quickly as possible.

- TheEpresent invention has for its object to provide an apparatus for obtaining this lopurpose in-connection with apparatus of the 1 type, wherein substantially vertical heating tubes are used, which tubes are attached at one end to a tube plate and are closed at their other end, tubes open at both ends being l5, provided concentric with said heating tubes leaving an annular space for the passage of the heating fluid and in which at least one of these heating tubes forms a secondary group connected in series with the primary group of tubes, the secondary group being supplied with steam which has already passed through the primary tubes.

According to the present invention in apparatus of the above type the methodfor 2 increasing the heat transmission efi'ect by increasin the flowing velocity of the steam along t e heating surface, consists in that part of the steam leaving the heating tubes is passed in circulation back through the latter, while another part is conducted through one. or more heating tubes arranged in series with the first mentioned heating tubes.

In the drawing two embodiments of the invention are illustrated diagrammatically, Figure 1 being a vertical section through one form of my invention and Figure 2 a similar section through a modified form thereof. Figs. 3 and 4 are cross sections on the lines 3-3 and 4-4 of Figs. 1 and 2, respectively, lookin in the direction of the arrows.

In t e heating apparatus of Figure 1 D is the vessel proper, through which passes the liquid, to be heated. R are tubes in the main group. 'L is the secondary tube,and 7: and l are pply pipes. SiXam is introduced through an inlet A and passes up through supply pipes 1' and down in the intermediate space'between 1- and R, the condensate passing out at B. Down into the condensate space 0 flows, in addition to condensate from the main group, any uncondensed steam and uncondensible gas. The steam and accompanying gas contained therein pass up through 1 and downwards in the interior of L, and gas and condensate are collected finally in the condensate space E, from which they are removed for instance throughF. h

In order to conserve, completely or partly, the steamvelocity in the interior of the heating tubes, the intermediate space between 1 and R and between Z andL is tapered gradually downwardly, and this may for instance be obtained practically by making the tube 1" slightly tapering.

By dividing up the heating tubes into several series or groups, the steam velocity can be increased. The last series may be constituted by but one tube, which in such case might conduct out all the accompanying permanent gas and may thus remove the gas from the whole tube set.

In order toincrease to a still greater extent the velocity of the steam in the main group, a portion of the steam may be passed in circulation by a fan or in another manner back through the main group of tubes.

For this purpose a fan V for example is arranged which draws steam from the condensate space C and compresses it up to original-steam pressure in steam space M.

' The maintenance of the flowing velocity in the space C is assisted by the condensation taking place in a series-connected tube or tubes L.

In this latter case a portion of steam and the uncondensible gas will always pass from G into the secondary group, wherein as mentioned only gas" and condensate will be left,

which latter are removed either continuously I or intermittently. The important thing is that the velocity of flow in the space is maintained by means of condensation taking place in a series-connected tube or tubes Z.

Claims:

1. Apparatus for liquid heating and evaporating comprising a plurality of vertically mounted tubes closed at their upper ends, the walls of said tubes being adapted to be brought into heat exchanging relation with the liquid to be heated, said tubes being open at their lower ends to a condensate chamber and open ended steam supply pipes extending through said tubes terminating near the closed ends thereof and leaving a space between said tubes and supply pipes, the annular space between said tubes and pipe having a progressively decreasing cross sectioh from the top downward.

2. Apparatus as claimed in claim 1, at least one of said pipes and tubes being in series with the rest of said pipes and tubes through communication of its tube and pipe with said condensate chamber, whereby permanent gas is carried off through said pipe.

3. Apparatus as claimed in claim 1 including a blower Ior sending the vaporous contents of said condensate chamber again through said supply tubes and pipes.

at. Apparatus as claimed in claim 1 at least one of said pipes and tubes being in series with the rest of said pipes and tubes through communication of its tube and pipe with said condensate chamber, whereby )ermanent gas is carried off through said pipe and including a blower for sending the vapo ous content of said condensate chamber agaimthrough the said rest of said tubes and pipes.

In testimony whereof I have signed my name to this specification.

EIN AR MORTERUD. 

